High-resolution resonant inelastic X-ray scattering study of W-L<sub>3</sub> edge in WSi<sub>2</sub>

ZHAO Zheqian; WANG Shuxing; WANG Xiyuan; SU Yang; MA Ziru; HUANG Xinchao; ZHU Linfan

doi:10.7498/aps.74.20250659

Abstract

With the advancement of synchrotron and free-electron laser, X-ray quantum optics has emerged as a novel frontier for exploring light-matter interactions at high photon energies. A significant challenge in this field is achieving well-defined two-level systems through atomic inner-shell transitions, which are often hindered by broad natural linewidths and local electronic structure effects. This study aims to explore the potential of tungsten disilicide (WSi₂) as a two-level system for X-ray quantum optics applications. Utilizing high-resolution resonant inelastic X-ray scattering (RIXS) near the W-L₃ edge, in this work, the white line of bulk WSi₂ is experimentally distinguished, overcoming the spectral broadening caused by short core-hole lifetime. The measurements are conducted by using a von Hamos spectrometer at the GALAXIES beamline of the SOLEIL synchrotron. The results reveal a single resonant emission feature with a fixed energy transfer, confirming the presence of a discrete 2p-5d transition characteristic of a two-level system. Additional high-resolution XAS spectra, obtained via high energy resolution fluorescence detection method and reconstructed from off-resonant emission (free from self-absorption effect for bulk WSi₂ sample) method, further support the identification of a sharp white line. These findings demonstrate the feasibility of using WSi₂ as a model system in X-ray cavity quantum optics and establish RIXS as a powerful technique to resolve fine inner-shell structures.

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Corresponding author: HUANG Xinchao, xinchao.huang@xfel.eu ; ZHU Linfan, lfzhu@ustc.edu.cn

Funds: Project supported by the User Experiment Approved by the SOLEIL Light Source (Grant No. 20220927), the National Natural Science Foundation of China (Grant Nos. 12404313, 12334010), and the European Free-Electron Laser HELIOS Project.

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Vol. 74, Issue 18 - 2025-09-20

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